CNSE 4.1 Exam Preparation GuideV3.pptx - Palo Alto Networks

Palo Alto Networks CNSE 4.1
Exam Preparation Guide
Palo Alto Networks Education
V.3

Additional Study Documents and White Papers
There is a companion pack of support documents that are to
be distributed with this CNSE 4.1 Exam Preparation Guide.
References to these related documents will be made in red
text throughout this guide.
The document pack in entitled “Palo Alto Networks CNSE
Tech Notes 2012”; it can be obtained from the same source
as this CNSE study guide.
Page 2 |
© 2012 Palo Alto Networks. Proprietary and Confidential 4.1

General Advice
• 100 multiple-choice/multiple select questions in 2.5 hours. You can go back to
previous questions, to change your answer if necessary.
• Passing score is 60%
• You need to have been working with the PA firewalls in order to get a
respectable score on the test. Make sure you have completed at least one tapmode
install (see this doc for steps):
Tech Note - PAN tap mode install.pdf
and one Layer3 install with NAT:
Tech Note - PAN_L3-Config guide.pdf
• When a how-to doc is listed here, it is highly recommended that you not only
read that doc, but actually go through the steps and perform the setup in that
doc (using PAN-OS 4.1 of course)
• Additional reference documents include the 4.1 Admin Guide:
4.1_admin_guide (_beta).pdf
• and the CLI guide:
PAN-OS_4.1_CLI_Reference_Guide.pdf
Page 3 |

Major Exam Topics
• Administration & Management
Page 4 |
- Device configuration, commit workflow
• Network Architecture:
- NAT, Packet Flow, SP3
• Security Policies/Profiles
- WildFire, URL-Filtering, DLP
• User-ID
- User-ID Agent, Captive Portal
• IPsec VPN
- Configuring route-based site-to-site connectivity
• SSL Decryption
- Inbound and outbound, SSHv2, certificates
• High Availability:
- Active/Passive, Active/Active
• Troubleshooting
- Connectivity, Panorama, NAT, VPN
• GlobalProtect
- SSL VPN, Certificates, HIP Profiles, HIP matches
• Panorama
- configuration management, commit workflow, pre and post policy, device groups, shared objects
and device group objects
© 2012 Palo Alto Networks. Proprietary and Confidential 4.1

PA appliances as of PAN-OS 4.1: 4000, 2000, 500 Series
PA-­‐4060
• 10 Gbps FW
• 5 Gbps threat preven2on
• 2,000,000 sessions
• 4 XFP (10 Gig) I/O
• 4 SFP (1 Gig) I/O
PA-­‐2050
• 1 Gbps FW
• 500 Mbps threat preven2on
• 250,000 sessions
• 16 copper gigabit
• 4 SFP interfaces
Page 5 |
PA-­‐4050
• 10 Gbps FW
• 5 Gbps threat preven2on
• 2,000,000 sessions
• 16 copper gigabit
• 8 SFP interfaces
PA-­‐2020
• 500 Mbps FW
• 200 Mbps threat preven2on
• 125,000 sessions
• 12 copper gigabit
• 2 SFP interfaces
PA-­‐4020
• 2 Gbps FW
• 2 Gbps threat preven2on
• 500,000 sessions
• 16 copper gigabit
• 8 SFP interfaces
PA-­‐500
• 250 Mbps FW
• 100 Mbps threat preven2on
• 50,000 sessions
• 8 copper gigabit

PA appliances as of PAN-OS 4.1: PA-5000 Series
PA-5060
• 20 Gbps FW
• 10 Gbps threat prevention
• 4 Gbps IPSec VPN
• 20,000 SSL VPN Users
• 4,000,000 sessions
• Up to 225 VSYS
(4) SFP+ (10 Gig) I/O
• (8) SFP (1 Gig) I/O
• (12) 10/100/1000
Page 6 |
© 2012 Palo Alto Networks. Proprietary and Confidential.
PA-5050
• 10 Gbps FW
• 5 Gbps threat prevention
• 4 Gbps IPSec VPN
10,000 SSL VPN Users
• 2,000,000 sessions
• Up to 125 VSYS
• (4) SFP+ (10 Gig) I/O
• (8) SFP (1 Gig) I/O
• (12) 10/100/1000
• Hot swappable fans, power supplies
• Dual, solid state hard drives
• Dedicated HA and management interfaces
• 2U standard rack mount form factor
PA-5020
• 5 Gbps FW
• 2 Gbps threat prevention
• 2 Gbps IPSec VPN
5,000 SSL VPN Users
• 1,000,000 sessions
• Up to 20 VSYS
• (8) SFP (1 Gig) I/O
• (12) 10/100/1000

PA Appliances as of PAN-OS 4.1: 200 Series
Page 7 |
• 100 Mbps firewall throughput (App-ID enabled 1 )
• 50 Mbps threat prevention throughput
• 50 Mbps IPsec VPN throughput
• 64,000 max sessions
• 1,000 new sessions per second
• 25 IPsec VPN tunnels/tunnel interfaces
• 25 SSL VPN Users
• 3 virtual routers
• 10 security zones
• 250 max number of policies
© 2012 Palo Alto Networks. Proprietary and Confidential 4.1

Five Physical Interface Types:
1. Tap mode interfaces simply listen to a span/mirror port of a switch
2. Virtual wire
- EXACTLY two interfaces, what comes in one, goes out the other
- Can be any combo (copper-copper, fiber-fiber, copper-fiber)
- no MAC address or IP addresses on the interfaces
- the device is still a stateful firewall and can block traffic
3. L2
- multiple interfaces can be configured into a “virtual-switch” or VLAN in L2
mode. L2 Interfaces do not participate in STP, as Spanning Tree Protocol
is not supported
4. L3
- IP address is required, all layer-3 operations available.
5. HA (on all devices except the 4000 and 5000 series, you must configure two
traffic ports as the HA ports)
Note that all interfaces, regardless of type, can be simultaneously supported.
Page 8 |

Logical Interfaces Supported
• Subinterfaces (802.1q)
- Up to 4094 VLAN supported per port
- Max of 4094 VLANs per system
• Aggregate interfaces (802.3ad)
- Only on PA-4000 and PA-5000 series
- Up to 8 physical 1 Gig interfaces can be placed into an aggregate
group
- Up to 8 aggregate groups are supported per device
- Each interface in a group must be the same physical media (all
copper, or all fiber)
• Tunnel interfaces- for IPSec or SSL VPNs
• Loopback interfaces
Page 9 |

Multicast Support
• Support for Multicast Filtering
- available in Virtual Wire and L3
- multicast IP addresses can now be used in firewall rules used with
Virtual Wires and L3
• Multicast routing is supported in PAN-OS 4.1 for PIM-SM sparse mode
and IGMP protocols.
• Additional information can be found in the following support document:
PaloAltoNetworks_DesignGuide_RevA.pdf
Page 10 |

Available Features in Different Interface Modes
Page 11 |
Vwire
L2
L3
- No VPN
- No "auto" setting for HA passive link
- No VPN
- No NAT (FYI in PAN-OS 4.1 you can do NAT in Vwire mode)
- No "auto" setting for HA passive link
- If IPv6 is passing, security policies can be written for this traffic
- No Multicast support
- If IPv6 is passing, security policies can be written for this traffic

Interface Management
• An interface management profile specifies which protocols can be used to
manage the firewall.
• Management profile can be assigned to:
- L3 interfaces
- Loopback interfaces
- VLAN interfaces
• Configured under Network tab -> Network Profiles ->Interface Management
Page 12 |

Device Management
• Managing the firewall (via GUI, SSH, etc.) is performed via the MGT
interface on the PAN by default.
• You can specify different physical interfaces to use for specific
management services via Device tab -> Setup -> Service Route
Configuration.
Page 13 |

Application Identification
• App-ID provides the ability to identify applications and application
functions. App-ID is a core function of the Palo Alto Networks device.
• App-ID uses various methods to determine what exactly is running in
the session:
- Protocol decoders
- Protocol decryption
- Application signatures
- Heuristics are used when the above methods can not identify the
application. This is the method by which applications such as the
proprietarily-encrypted BitTorrent and UltraSurf are identified
• App-ID even works in these scenarios:
Page 14 |
- If the application is running on a different port than expected
- If the application is being transmitted in an SSL tunnel (the firewall can
forward proxy the SSL connection) or if it employs SSHv2
- If the application is going through an HTTP proxy

Application Selection Window
Within each policy, you can specify what applications you want to control. You can
specify individual applications, or groups of applications. Some applications, such
AIM instant messenger and Facebook, give you control over specific functions.
Applications with Application Function Control are represented hierarchically.
Page 15 |
© 2012 Palo Alto Networks. Proprietary and Confidential 4.1
Dynamic Filter
Individual
Application
Static Group

Dynamic Application Filters
• A dynamic application filter is configured by specifying particular criteria.
• The example below is a dynamic filter of all browser-based file-sharing
apps.
• Advantage of dynamic application filters: any new applications that fit into
those categories will automatically be added to that dynamic filter.
Page 16 |

Application Groups and Application Filters
• Applications Groups are static. Applications are manually added and
maintained by firewall administrators.
• Applications Filters are dynamic. Applications are filtered by traits such as risk,
subcategory, technology, characteristic, etc.
• If you create an Application Filter on a specific criteria, such as the
subcategory of games’, it will include all applications which are defined as a
game. Any new games defined by an APP-ID signature will automatically be
included as part of this filter.
Page 17 |
© 2012 Palo Alto Networks. Proprietary and Confidential 4.1

Security Policy Operation
• All traffic flowing from one security zone to another security zone requires a policy to
allow the traffic
• The policy list is evaluated from the top down
• The first rule that matches the traffic is used
• No further rules are evaluated after the match
• When configuring a security to allow an application through the firewall, the service field
should be set to “application-default” for inbound services. That will restrict the
application to only use its standard ports (example: DNS will be restricted to only use port
53). It is a best practice to configure application-default or an explicit port(s) for increased
control of the communication on the network
• Note that intra-zone traffic is allowed by default
• If you create a rule at the end of the list that says to deny (and log) all traffic, that will
block intra-zone traffic (which may not be your intention)
Page 18 |

Scheduling Security Policies
• Policies can be scheduled to occur at particular times of day, or be a one-time
occurrence
• Schedules are defined under Objects tab-> Schedules
Once defined, these Schedules can be reused across multiple rules
• Possible schedule choices:
• Schedules are assigned under Policies tab -> Security Policy-> Options column
Page 19 |

Blocking Skype
• The skype application is classified on the PAN device as two separate
applications: skype-probe and skype.
• In general, think of the skype-probe application as the control channel,
and “skype” application as the data channel.
• Since skype is so evasive, the way you prevent skype from sending or
receiving voice or video is by allowing skype-probe, but blocking
skype.
• This forces skype to use a communication that is easy to predict and
block via App-ID
Page 20 |

Monitoring Traffic
• The default traffic log behavior is to log all at session close. On a per-rule basis,
the functionality logging at session start/session end can be selectively toggled or
disabled completely
• Traffic log can be viewed under Monitor tab -> Logs -> Traffic.
• The application that was detected is shown in the log.
• Filters can be created, using a syntax similar to Wireshark
Page 21 |
- Here is an example where you are viewing all traffic between 1.2.3.4 and 3.3.3.11:

Monitoring Traffic (2)
Special Application names are used to define traffic not explicitly identified by App-ID.
These application will be displayed in the Traffic log as follows:
• “incomplete”
- SYN or SYN-SYNACK-ACK is seen, but no data packets are seen
• “insufficient-data” means that either:
- The firewall didn’t see the complete TCP 3-way handshake, or
- There were no data packets exchanged after the handshake
• “unknown-tcp”
- Application consists of unknown tcp traffic.
• “unknown-udp”
- Application consists of unknown udp trafic.
• “unknown-p2p”
- Application matches generic p2p heuristics
• “not-applicable”
Page 22 |
- Session is blocked by the firewall

Log Forwarding
• The logs on the firewall can be forwarded to multiple locations. Upon
generation of a log message, that message can be immediately
forwarded to:
- Syslog server
- SNMP manager
- Email
- Panorama
• You configure the log message destination via a Log Forwarding
Profile:
Page 23 |

Unknown Applications
• Scenario: a network has a particular application that runs on a specific
port, yet the Palo Alto firewall identifies it as “unknown-tcp” or
“unknown-udp”
• To configure the firewall to identify this app, you will need to do three
things:
Page 24 |
1. Create a new application
2. Create an application override policy
3. Make sure there is a security policy that permits the traffic

Steps to Define a New Application
1. Objects -> Applications, click New
- Specify the application name and properties
- On advanced tab, enter the port number that uniquely identifies the app
- Nothing else required, click ok
2. Policies -> Application Override-> Add Rule
- Specify port number
- Config application to be
the one you just created
3. Policies -> Security -> Add Rule
- Configure as appropriate: src zone/dest zone/src addr/dest addr/src user
- Select the new app in the application column
- For service, select “application default”
- Select the action you want (permit/deny)
4. Commit
Page 25 |

More on Unknown Applications
• App override policies are checked before security policies. The app
override policy will be used in place of our App-ID engine to identify the
traffic.
• Security profiles CANNOT be assigned to Application Override
policies. Application Override policies bypass the Signature Match
Engine entirely, which means that this also eliminates the option of
performing Content-ID on this traffic. Because of this fact, the
Application Override feature should be used with internal traffic only.
• The solution on the previous page is a short-term solution. If the
application is a common-use application, it is recommended that the
customer submit pcaps of the application to Palo Alto Support. Then
our engineering team can create a new signature for the particular app.
Page 26 |

Source Address Translation
• NAT rules are in a separate rulebase than the security policies.
• Palo Alto firewall can perform source address translation and destination address translation.
• Shown below is the NAT rule as well as the security rule to perform source translation
• See powerpoint notes below for more info
Page 27 |
SA DA SP DP
10.1.1.47 4.2.2.2 43778 80
• Post NAT: From L3-trust -> L3-untrust
• Pre NAT: From L3-trust -> L3-untrust
SA DA SP DP
64.3.1.22 4.2.2.2 1031 80

Destination Address Translation
See powerpoint notes below for description
Page 28 |
SA DA SP DP
12.67.5.2 64.10.11.103 5467 80
Notice the destination zone is the same as the source zone
• Post NAT: From L3-untrust -> L3-trust
• Pre NAT: From L3-untrust -> L3-untrust
SA DA SP DP
12.67.5.2 192.168.10.100 5467 80
Notice the destination zone is based upon the post-NAT address

Security Profiles
• Security Profiles look for malicious use of allowed applications
• Security Policies define which applications are allowed
• Profiles are applied to policies that allow traffic
Page 29 |

Using Security Profiles
• The profile used for traffic is based on the policy that allows the traffic
• Example:
• Open Twitter: Student users, no URL filtering profile
• Limited Twitter: All other users, URL filtering to specific twitter URL’s
Page 30 |

Anti-Virus Profiles
Page 31 |
• A decoder is a software
process on the firewall
that interprets the
protocol.
• In the antivirus and
anti-spyware security
profiles, you can
specify actions based
upon the 6 main
decoders in the system,
shown to the left.

Configuring Exceptions
• If you have a threat or virus that you do not want to be detected, you can configure an
exception
• Two ways to configure an exception:
Page 32 |
1. On the security profile, go to the exceptions tab, enter the threat ID there:
2. In the threat log, click on the threat or virus name. In the pop-up window, next to
exceptions, click “show”, then select the profile to add the exception to.

Email Protocols and AV/Spyware Protection
• If a Palo Alto Networks firewall detects a virus or spyware in SMTP,
a 541 response is sent to the sending SMTP server to indicate that
the message was rejected. This allows the Palo Alto Networks
firewall to effectively block viruses distributed over SMTP.
• For POP3/IMAP, the only action the Palo Alto Networks device can
will ever take is “alert”. The device will never block or drop for these
protocols, even if you configure an action of “block”.
• The reason for this is because POP3/IMAP protocols will continue to
resend the email message again and again if an intermediate device
tries to close the session. This is a limitation of the POP3/IMAP
protocols.
Page 33 |

Vulnerability Protection
• Provides IPS functionality
• Detects attempts to use known exploits on the network
Page 34 |

Custom Response Pages
• Response pages are configured under Device tab ->
Response pages
• You can externally edit and upload those response pages
to the device
• Only the html file can be uploaded to the device, images
cannot be uploaded
• Response pages are displayed in the web browser only
and pertain only to web-based applications
- Thus if a threat is detected during say a BitTorrent session, the
response page will not appear
• Response Pages for web-based applications are not
enabled by default
Page 35 |

Disable Server Response Inspection
• The vulnerability protection
profile by default scans traffic
going in both directions (from
client to server, and from
server to client)
• Most IPSs only examine the
traffic from the client to
server.
• The way to examine traffic
from only client to server on
the Palo Alto firewall is to
check the box to “disable
server response inspection”
on the security policy
(options column).
Page 36 |

URL Filtering Profile
• Actions can be defined
for each category
• Notification page for user
can be customized
• Allow List and Block List
accept wild cards
- To specify all servers in a
domain called xyz.org, two
entries must be created:
Ø xyz.org
Ø *.xyz.org
• Upon URL license
expiration, URL database
is no longer used; traffic
is allowed or blocked
based upon the “action
on license expiration”
field shown here.
Page 37 |

URL Filtering Actions
• Allow – Traffic is passed, no log generated
• Block – Traffic is blocked. Block log generated
• Alert – Traffic is allowed. Allow log generated
• Continue – User is warned that the site is questionable. Block-
Continue log generated
- If user clicks through the traffic is allowed and a Continue log is
generated
• Override – Traffic is blocked. User is offered chance to enter override
password. Block-Override log generated
Page 38 |
- If user enters password the traffic is allowed and an Override log is
generated

Default Block Pages
Page 39 |

Misc. URL Filtering Topics
• Order of checking within a profile:
1. Block list
2. Allow list
3. Custom Categories
4. Cached
5. Pre-defined categories
• “Dynamic URL filtering”
- Can be enabled on each URL filtering profile
- If enabled, the PA device will query the cloud to resolve URLs that
are not categorized by the on-box URL database
• To determine the category of an URL from the CLI:
Page 40 |
- test url

Data Filtering Overview
• Scan traffic for potentially sensitive strings of data
- Data strings defined by regular expressions
- Data pattern must be at least 7 bytes in length
- Default strings are defined for SSN and credit card numbers
• Each data string is assigned a weight
• Alert threshold and block threshold is based upon weights
Page 41 |

Data Filtering Example
Credit Card Weight = 1
SSN Weight = 2
Alert Threshold = 4
Block Threshold = 8
Page 42 |
(4)
(1)
(3)
+
Single
Session
Count =1
+
Count =4
Alert
+ +
Count =8
Block

Data Filtering Password Setup
• PCAPs on data filters require a password to be configured prior
- Single password for firewall, stored locally, configured on Device
tab-> Setup screen
• See PowerPoint notes below for more info
Page 43 |

Zone Protection
• For each security zone, you can define a zone protection profile that specifies
how the security gateway responds to attacks from that zone.
• The same profile can be assigned to multiple zones.
• The following types of protection are supported:
- Flood Protection—Protects against SYN, ICMP, UDP, and other IP-based
flooding attacks.
- Reconnaissance detection—Allows you to detect and block commonly used
port scans and IP address sweeps that attackers run to find potential attack
targets.
- Packet-based attack protection—Protects against large ICMP packets and
ICMP fragment attacks.
• Configured under Network tab -> Network Profiles -> Zone protection
Page 44 |

WildFire
• WildFire relies upon two main technologies: a virtual sandbox environment and
a malware signature generator
• WildFire is enabled via the “Forward” and “Continue-and-Forward” file-blocking
actions
Page 45 |
• Wildfire
Cloud
Files
Signatures
File
Submission
Comparer
Automated
Signature
Generator
Virtual Test
Environment
Admin Web
Portal

WildFire
• Provides a virtual sandbox environment for Windows PE files
• A hash of each file is sent to the WildFire cloud. If no existing signature exists, the
file is uploaded. The new signature will be made available as part of the next AV
Update
• Files up to 10 MB in size can be manually uploaded to the WildFire portal for
inspection
Page 46 |

Packet Flow
• Refer to this document on the packet flow in PAN-OS:
PANOS Packet Flow.pdf
• Have a general understanding of how packet are
processed by the Palo Alto Networks firewall
Page 47 |
- Determine which of the following is checked first: NAT rules,
security rules, PBF rules, app-ID
- Prior to the session being established, a forward lookup is
performed to determine what the post-NATed zone will be.
- The packet flow process is intrinsically tied to the Single Pass
Parallel Processing (SP3) hardware architecture of the Palo Alto
Networks next-generation firewall.
- Applications are identified once a session is created on an allowed
port.

Role-based Administration
• Administrators can be given rights using the built in options or by
creating new administrative roles
• There are 6 pre-defined administrator roles:
- Superuser – All access to all options of all virtual systems.
- Superuser (read-only)
- Device Admin – Full access to the device except for creation of
virtual systems and administrative accounts.
- Device admin (read-only)
- Vsys Admin – Full access to a specific virtual system.
- Vsys admin (read-only)
• To provide a more granular level of control, additional roles can be
created.
Page 48 |

User-ID: Enterprise Directory Integration
• Users no longer defined solely by IP address
Page 49 |
- Leverage existing Active Directory or LDAP infrastructure without complex agent rollout
- Identify Citrix users and tie policies to user and group, not just the IP address
• Understand user application and threat behavior based on actual
username, not just IP
• Manage and enforce policy based on user and/or AD group
• Investigate security incidents, generate custom reports

Where are Usernames Used?
1. Stored in Logs
• Sort log data by User / Group
• Filter logs by User
2. As a Value to Match in Security Policy
• Control application use by group
• Separate unknown user traffic from known user traffic
3. In URL-Filtering Response pages, User Name will be displayed
Page 50 |

User-ID Agent Setup and Upgrade Procedure
One agent is used for all directory services (AD,
LDAP, eDirectory)
• The agent setup process is outlined here:
Tech Note - PAN User-ID Agent install steps.pdf
• The most recent version of User-ID agent should always be
used. PAN-OS will auto-detect the agent version and change
it’s behavior accordingly. The best practices when
implementing the agent are outlined here:
Tech Note - User Identification Best Practises PANOS 4.1.pdf
• When upgrading from a previous agent version to the 4.1
User-ID agent, use the following procedure:
Tech Note - User-ID_Upgrade_4.1.pdf
The User-ID API can be employed when connectivity to
another identity management system is required

Installing the User-ID agent
• For detailed instructions on the operation of the User-ID Agent, read this
document in detail: User-Identification-Operations-4.0.pdf
• Note that a best practice would be to install two User-ID Agents for each
domain in the forest (for redundancy)
• In addition to mapping IP addresses, the User-ID agent can also act as
an LDAP proxy, to assist in the enumeration process. This behavior is
enabled through the selection of the “Use as LDAP Proxy” checkbox:
• Don’t forget to enable user-ID in the zone which
contains the users!
Page 52 |

Terminal Server Agent
• Runs on the Terminal or Citrix Metaframe server
• TS Agent modifies the client port number from each user
• Firewall tracks user by source port, not by IP address
Page 53 |
User A
User B
• User A gets ports
20400 - 20800
Terminal Server
with TS Agent
Internet

Captive Portal
• Captive portal is a feature of the Palo Alto Networks firewall that
authenticates users via an alternate source, such as a RADIUS server.
• Use captive portal when:
Page 54 |
- You have Windows users that are not logging into the AD domain
Ø Authentication can be transparent if using NTLM authentication
- You have Mac or Unix workstations
Ø Users will see a login prompt
Ø Users using captive portal without
transparent NTLM authentication
can be authenticated against RADIUS,
Kerberos, LDAP, AD, or the local firewall.
- You wish to invoke user identification
for users that were not identified via one of the other user identification
methods
• Once users authenticate with the firewall, user-based policies can be
applied to the user’s traffic.

Captive Portal (2)
• How to configure Captive Portal:
Tech Note - Captive Portal Transparent vs Redirect mode v3.1.pdf
Tech Note - How to configure Captive Portal in PANOS 3.1.x L3.pdf
Tech Note - How to Configure Captive Portal in PANOS 3.1.x Vwire.pdf
• A portion of this doc references certificate authentication;
certificates are available with PAN-OS 4.0 or higher. The
rest of the doc is applicable to PAN-OS 3.1
- Captive Portal NTLM authentication requires the User ID Agent to be
installed. The User ID agent must have the “Use for NTLM
Authentication” checkbox selected.
Page 55 |

Implementation of IPSec in PAN-OS
• PAN-OS implements route-based site to site IPSec VPN’s
- No IPSec client software available (use SSL VPN instead)
• The destination of the traffic determines if a VPN is required
• The tunnel is represented by a logical tunnel interface
- One tunnel interface can support 10 IPSec tunnels
• The routing table chooses the tunnel to use
• 192.168.10.0/24
Page 56 |
• 24.1.1.12
Routing Table
10.2.0.0/24 -> Tunnel.
1
Tunnel.1
Peer:
161.10.12.64
• IP Sec Tunnel
• 161.10.12.64
• 10.2.0.0/24

Steps to Configure an IPSec site-to-site VPN
1. Create a tunnel interface
- Under the Networks tab-> Interfaces-> New Tunnel Interface
- Assign it to a L3 Zone and a Virtual Router
2. Configure the IPSec Tunnel
- Under Networks tab, IP Sec Tunnel
- If site to site with another PAN-OS device use simple configuration
- Set advanced options if required
3. Add static route to the appropriate Virtual Router or enable dynamic
routing protocol
- Under Networks tab, Virtual Router
- Create a route for the remote private network using the tunnel interface
Dynamic routing protocols will traverse the tunnel if you assign a static IP
to the tunnel interface
Page 57 |

Notes about IPSec site-to-site VPNs
• Possible IKE phase 1 authentication methods:
- Pre-shared key only
• It is possible to configure multiple phase 2 IP IPSec tunnels to use the
same phase 1 gateway, as long as each phase 2 config uses different
proxy IDs on that same tunnel interface.
• You can attempt to bring up all ipsec tunnels on the device via:
test vpn ipsec-sa
• How-to configure IPSec VPNs:
Tech Note - How to configure site2site IPSec 4.0.pdf
• There are two docs, read the one titled “How to Configure an IPSec VPN”
Page 58 |
- There are a number of questions on IPsec, you should definitely follow this doc to
configure a tunnel.

GlobalProtect - SSL VPN
• PAN-OS supports not only IPSec site-to-site VPNs, but SSL VPNs. SSL VPN’s
are provided via the GlobalProtect agent
• The GlobalProtect agent will run on Win32/Win64 and OS X 32-bit/64-bit clients
• The native VPN client on Apple iOS devices is officially supported via XAuth
• Interface types that can be used for the SSL VPN portal:
- L3 interface
- Loopback interface
• Prior to PAN-OS 4.1 NetConnect was the VPN client employed for SSL VPN’s.
To migrate NetConnect to GlobalProtect, follow this procedure:
Tech Note - NC to GP Migration.pdf
• GlobalProtect can be installed as a basic Ipsec/SSL VPN or configured to make
use of HIP profiles and HIP matches. Quickstart GlobalProtect guide:
Quick Start Guide Global Protect ver2.pdf
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SSL VPN Client Configuration Screen
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SSL Decryption
• The Palo Alto firewall can perform SSL decryption on connections that
are initiated inbound or outbound, so that the traffic can be inspected
for threats or restricted apps
• Inbound decryption:
- Use when you want to intercept and decrypt users traffic coming
from the Internet to your DMZ servers
- You must load onto the firewall the same certificates that are on
your DMZ servers
• Outbound decryption:
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- Use when you want to decrypt users traffic coming from the internal
network and going to the external network
- You need to have a PKI infrastructure in place for this to be
transparent to the user
- This is referred to as “forward-proxy”

Configuring SSL Inbound Decryption Certificate
• All certificates on the device (inbound/outbound/admin UI/etc) are
centrally managed under the “Certificates” node on the “Device” tab
• You can add edit a certificate to establish it as an SSL inbound
certificate. You should create one certificate for each DMZ server
that you will be decrypting traffic for
• You can establish different SSL inbound certificates for different
inbound SSL decryption rules.
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Configuring SSL Outbound Decryption Certificate
• You can either generate a self-signed certificate (good for testing purposes),
or import a certificate from your company’s certificate server.
• In order to prevent users from seeing a browser certificate error, it is
recommended that you have a PKI infrastructure deployed in your
organization. Therefore you will be able to import into the firewall a certificate
that is trusted by the users’ browsers.
• When no internal PKI infrastructure is available, it is possible to distribute the
firewall CA certificate to clients e.g. using Group Policy Objects functionality
in Active Directory.
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Configuring SSL Inbound or Outbound Policies
Once the appropriate certificates are imported/created, SSL Decryption
policies can be created. For either inbound or outbound decryption, the
policies are configured under Policies tab -> SSL Decryption.
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- For inbound decryption, add a rule that looks like the following. This
will decrypt traffic from the Internet to the public web server.
- For outbound decryption, and add two new rules that look like this:
Ø The first rule will not decrypt any traffic going to the URL
categories of finance, health, and shopping.
Ø The second rule will decrypt (proxy) all other connections. Make
sure to choose action “decrypt” on the second rule

Misc. SSL Decryption
• When SSL is decrypted, the app running inside the SSL
session will appear in the traffic log. For example:
- https://facebook.com, SSL decryption NOT enabled, traffic log will
show application is SSL
- https://facebook.com, SSL decryption enabled, traffic log will show
application is facebook
• The firewall will NOT send a response page for a virus
detected with decrypted SSL traffic
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High Availability: Active/Passive
• 2 unit cluster provides Stateful synchronization
• HA 1 syncs certificates, response pages, and configuration
- Communications can be encrypted by swapping the HA keys on both firewalls
• HA 2 syncs are Stateful session information between both devices
• Split-brain, in which both firewalls are attempting to take control as the
Active device, can be controlled by enabling HA1 backup and/or
enabling Heartbeat backup
Primary Path
Secondary Path
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Config
State

HA Failure States
• Link Failure
- One or more physical links
go down
• Path Failure
- IP Address connectivity
• Combinations
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- Multiple possible failure
states

High Availability: Active/Active
• Requires a Group ID to uniquely identify both Devices within an
HA Cluster
• Requires the selection of Active Active mode
• Requires the “Enable Config Sync” checkbox to be selected
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Cluster
(Group) ID
Device ID
0 or 1
HA1 link

Active/Active | HA3 interface
• A third HA interface is required for Active/Active HA. This interface
provides Packet forwarding for Session Setup and L7 processing
(App-ID and Content-ID) in asymmetrically-routed environments
If enabled, Zone,
Routing, and VR
configuration sync’d
“IP Module”, “Primary
Device” or “IP Hash”
If unchecked, this will
be an Active/Passive
configuration
If disabled, no virtual
IP shared between
firewalls

Misc HA
• How to configure Active/Passive HA in PAN-OS 4.x:
Tech Note - HA Active Passive 4.0.pdf
• How to configure Active/Active HA in PAN-OS 4.x:
Tech Note - HA Active Active 4.0.pdf
• HA failover can be triggered by the following three mechanisms:
- Link failure
- Path failure
- Heartbeat loss
• Command to view the HA settings/status:
- show high-availability state
• Upgrading a PAN-OS 3.1 HA cluster to PAN-OS 4.0
https://live.paloaltonetworks.com/docs/DOC-1751
• If Pre-emptive mode is enabled, the firewall with the lowest priority setting
will become master. Pre-emptive mode must be enabled on both firewalls.
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Panorama
• Central source to view log / report data, as well as to centrally manage the firewalls
• Virtual Appliance (on Vmware)
• Supports shared policies
• Connects to firewall using SSL
• Panorama is sold separately from the firewalls in 25/100/1000 license versions (licensed by firewall,
not by virtual system)
• Firewalls are managed in Device Groups. Pre and post policies are pushed to Device Groups by
selecting the appropriate Device Group/s as a “Target” when creating new rules within Panorama
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Panorama GUI
• Uses similar GUI as devices
• “Panorama” tab provides management options for
Panorama
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Adding Devices to Panorama
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Shared Policy
• Rules can be added before or after device rules
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- Called pre-rules and post-rules
• Rules can be targeted to be installed on specific devices

View and Commit
You can view a combined policy for any device
You can push policy changes via
Panorama managed devices screen
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Additional Notes on Panorama
• The firewall uses the config on the device itself. Panorama
can store a backup copy of each firewall’s config.
• The only thing that affects each firewall’s config are the
pre-rules and post-rules.
• When you make a change locally on the firewall, and that
device is being managed by Panorama, you do NOT need
to re-import the device, or synchronize the config between
panorama and the firewall. The pre and post rules are still
maintained on the firewall.
• The connection between a firewall and Panorama can be
severed by selecting the “Disable Shared Config” option on
the firewalls’ Device tab.
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Topics that have minimal or no questions
• Dynamic routing
• QoS
• Policy-based forwarding
• CLI commands (there will be questions testing the ability to
read CLI command output, but not the commands
themselves)
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